Shotcrete has been widely used in tunnel, underground, and marine works for providing early support and preventing water seepage. Key performance indicators of the shotcrete are setting time and strength, which are decided by not only mixture design but also the use of the accelerator. The accelerator alters the hydration mechanisms of the cementitious material, influencing its strength development and setting time. Shotcrete accelerators enable you to achieve very early hardening combined with optimum shotcrete adhesion to the substrate with minimal bounce/ricochet.
However, most existing accelerators are types of alkaline powdery accelerators which will lead to caustic harm and dust pollution and dramatically cut down the long-time strength and the inhomogeneity of concrete. In order to solve such problems, FAIRMATE has developed SETCRETE AF, alkali-free liquid accelerators with advantages of high efficiency, high strength, and environmental friendliness have gained more and more attention.
SETCRETE AF has many advantages which are as followed :
- The quick setting property allows rapid work progress and the ability to construct thick sprayed concrete linings via layered application during one construction sequence.
- The unique product formulation provides fast setting, continuous early-age strength development, high durability and good long term strength.
- Very low dust generation during application and therefore a good working environment.
- Possibility of low rebound applications when using the correct nozzle angle and distance.
- Non-aggressive properties provide improved working safety, reduced environmental impact and lower handling costs.
SETCRETE AF is to be used where high early and final strength is wanted, and where risk of alkali aggregate reactions should be reduced.
SETCRETE AF is added undiluted at the nozzle. Normal dosage is 5-10% of the weight of the cement.In cold regions concrete can freeze before it gains strength which breaks up the matrix so for these reasons SETCRETE AF is recommended to accelerate the hydration reactions in concrete which allows it to gain early strength.
For more details visit: www.fairmate.com